Level: 2 Credit value: 10 Unit aim The use of computer aide design (CAD) systems in industry has become an essential part of the modern working environment. It is used at all stages of the design period, from conceptualisation and production of working drawings to the production of virtual reality images. This unit aims to further candidates understanding of the CAD Parametric Modelling environment. Learning outcomes There are six learning outcomes to this unit. The learner will be able to: 1. use complex sketching and 2D constraints to create features 2. create and edit work features and use complex feature commands 3. create and modify simple table driven parts and assemblies 4. use motion and driven assembly constraints 5. add additional information to a drawing layout to aid the interpretation of design intent 6. create presentation quality displays of parts and assemblies Guided learning hours It is recommended that 90 hours should be allocated for this unit. This may be on a full-time or parttime basis. This unit is linked to the Performing Engineering Operations Level 2, unit 61 Producing CAD models (drawings) using a CAD system. This unit is endorsed by SEMTA. Key Skills This unit may help candidates to gain confidence in, and possibly generate portfolio evidence for, the following Key Skills: Communication Information and Communication Technology Improving Own Learning and Performance Problem Solving Assessment and grading This unit will be assessed by: 1. two assignments covering practical skills 2. one GOLA on-line test covering underpinning knowledge. Award in computer Aided Design and Manufacturing (7579-01) 31
Outcome 1 Use complex sketching and 2D constraints to create features 1. share the sketch to re-use sketch geometry to create additional features 2. roll back through an object to aid in the creation of sketches on planes within the body of the solid 3. apply the use of the project command to create new sketches based on the geometry of other parts and features 4. apply the use of simple equations in sketch dimensions to drive part design intent and allow display of those equations on screen 5. apply the use of advanced sketching features such as mirror, offset, copy, move and pattern. Underpinning Knowledge 1. explain the reasons for sharing sketches to create multiple features 2. explain how splitting an object aids in the creation of sketch geomtery 3. state how projecting geometry between parts aids creating linked parts 4. explain how using equations in sketch geometry helps drive part design intent 5. explain advantages of using the advanced sketching feature 6. identify sketching features such as mirror, effect, copy, move and pattern 32 Award in computer Aided Design and Manufacturing (7579-01)
Outcome 2 Create and edit work features and use complex feature commands 1. create and edit work features such as planes, axes and points from existing part and assembly geometry. 2. create and edit work features from existing planes, points and axes. 3. create and edit face drafts 4. create and edit complex ribs, webs and struts up to existing geometry from open and closed profiles 5. create and edit a swept feature from a sketched shade following existing 2D geometry 6. create and edit a coiled feature from a sketched shape 7. create and edit a simple loft feature between two sketched shapes or between two sections of existing geometry 8. split parts, using existing geometry, planes or sketches to define the split position 9. apply the use of the mirror command to create additional features from existing geometry and features 10. create an embossed or indented shape from a sketch onto a part or assembly 11. apply the use of the advanced features for hole definition to allow for counter bores, countersinking, thread details and clearances 12. add cosmetic threads to shafts and bored holes 13. create suppressed features in parts and assemblies Underpinning Knowledge 1. explain the purpose of work planes, axes and points 2. explain why the rib and web commands would be used in preference to the extrude command 3. explain the type of features the sweep, coil and loft commands would create 4. state where the split command would be used 5. explain reasons for the use of mirrored features 6. explain the advantages of the hole feature 7. explain the application of using an embossed or indented shape 8. explain the advantages of the thread feature 9. explain the reasons for suppressing features 10. explain the reasons for using face drafts Award in computer Aided Design and Manufacturing (7579-01) 33
Outcome 3 Create and modify simple table driven parts and assemblies 1. add meaningful names to sketch dimensions to allow relationships and design intent to be identified 2. apply the use of commands and actions within the parametric modelling software to allow parts to be created and modified through the use of simple tables 3. apply the use of commands and actions within the parametric modelling software to allow assemblies to be created and modified through the use of simple tables 4. apply the use of tables to control the display or suppression of features within a part 5. apply the use of tables to control the display or suppression of parts within an assembly 6. apply the use of commands to create new parts with features derived from the geometry of existing parts and features within an assembly 1. state reasons for naming dimensions 2. explain the uses for table driven features 3. explain how table driven parts are created and used 4. explain how table driven assemblies are created and used 5. explain how derived features can be used to create new parts based on the geometry of a previous part 6. explain what is meant by the term derived feature 7. explain the reasons for using tables for suppressing features 34 Award in computer Aided Design and Manufacturing (7579-01)
Outcome 4 Use motion and driven assembly constraints 1. specify intended motion ratios between assembly components 2. drive the motion constraints with an assembly file 3. create exploded assemblies that show how the parts fit together 4. export in a suitable file format a driven assembly model to allow animated display outside of the parametric software 1. explain the reasons for constraining the relative motion of parts within an assembly 2. explain how the constraints can be driven to provide the relative movement of parts within an assembly 3. explain the reason for using exploded assemblies 4. identify suitable file formats for animated assembly files. Award in computer Aided Design and Manufacturing (7579-01) 35
Outcome 5 Add additional information to a drawing layout to aid the interpretation of design intent. 1. create and use standard templates including different projections and dimensions styles 2. create template files 3. create and use sketched symbols within the drawing environment 4. create and edit and display hole and thread notes 5. apply the use of enquiry commands to find and display dimensional or other information about a part or assembly 6. create projected and auxiliary views 7. add additional dimensions to view using existing drawing standards 8. create section and detail views of parts and assemblies 9. create and edit parts lists and balloon referencing within a drawing 10. create and edit revision tables and tags within a drawing 11. add standard symbols to drawings to aid identification of design intent in a manufacturing environment 12. produce hard copy output to a print/plot device using appropriate scales 13. create files for exporting to manufacturing devices 1. recognise the difference between first and third angle projections 2. recognise the difference between a projected and auxiliary view 3. explain when section and detail views would be needed 4. explain how sketched symbols are created 5. explain how hole and thread notes are created 6. explain how a parts list/bill of materials table is created and edited 7. explain the use for revision tables and tags 8. identify suitable file formats for exporting to manufacturing devices 9. explain the effect of modifying views 10. explain the reasons for using and creating template files 36 Award in computer Aided Design and Manufacturing (7579-01)
Outcome 6 Create presentation quality displays of parts and assemblies 1. create a basic scene layout and apply standard rendering 2. define settings for rendering quality, lighting and background image 3. apply textures and material types to parts as appropriate 4. alter the image display to show parts or assemblies in perspective view 5. save rendered scene in a suitable file format for transferring into other graphics packages 1. explain the term photorealistic in the context of a rendered scene of parts or assemblies 2. explain the need for presentation graphics in the design for manufacture environment 3. identify suitable file types for transferring of graphical bitmap images. Award in computer Aided Design and Manufacturing (7579-01) 37